So ? What's the problem ?

Temporary change IP on Microsoft servers and wait for resolution from SpamCop.

Just for a record - has no any reverse DNS records. Something that is a must for legitive servers.

Check this and find that there is even more funny results. reversed to thich give only one incorrect IP in return.
Or -> -> No record.

This is plain wrong and a subject to fix.

I understand that there can some misterious reasons inside Microsoft to create following configuration - but they are unknown to me.
IT inside Microsoft are paid well to be able correct this in 1 hour ;o))